Final answer:
The varicose ulcer dressing change should be classified as a high priority.
Step-by-step explanation:
The nurse should classify the varicose ulcer dressing change as a high priority. A varicose ulcer is an open wound that can easily become infected, and in the case of the patient in the acute care unit, it has been progressing rapidly with signs of necrotizing fasciitis. This is a serious condition that requires immediate attention to prevent further complications.